Value control and multiplying circuit for game apparatus



D. E. HOOKER VALUE CONTROL AND MULTIPLYING CIRCUIT FOR GAME APPARATUS Filed Nov. 1:, 1950 4 Donald E. Hooker M 7 y N wh um w 233 s win April 14, 1959 A N m u 3 5 6 0 mmwwwal (v R5 85033. :zaEE W Xmw. w fl BNQA NN E 0356.39

United States Patent VALUE CONTROL AND MULTIPLYING CIRCUIT FOR GAME APPARATUS Donald E. Hooker, Skokie, Ill., assignor to Raymond 'I'. Moloney, Chicago, 111.; American National Bank and Trust Company of Chicago, a national banking association, executor of the estate of said Raymond T. Moloney, deceased Application November 13, 1950, Serial No. 195,340

17 Claims. (Cl. 273-118) This invention pertains to control circuits for counting, scoring, and like purposes, and has as its principal object the provision of an inexpensive and simple circuit means for multiplying a basic or normal pulse value by some factor, for example two, under certain desired or selected conditions.

In one of its more detailed objects, the control circuit herein disclosed is adapted to use in game apparatus to double the score award under certain conditions, to atford the players interesting variations in scoring possibilities.

More detailed objects relate to the provision of a value :ontrol circuit which includes switching devices and relays actuated by alternating current, and rectifier means and shunts connected to selectively actuate an award or counting control circuit on half or full-wave components of the current or voltage cycle with attendant selective effects dependent upon whether the positive or negative polar phase of the voltage cycle is selected or utilized.

Additional objects and aspects of novelty and utility characterizing the invention will become apparent as the following description proceeds in view of the annexed drawing, in which:

The single figure is a circuit diagram of a multiplying control circuit arranged for doubling or a multiplying factor of 2.

For purposes of simplified exemplification, the illustrative circuit discloses a control unit suitable, for use in a game employing a known form of electrically actuated totalizer or score-award device having an actuating coil 10.

The control circuit is powered from an alternating current supply source, for example the standard 60-cycle power mains connected to conductors 11 and 12 when some form of master game switch 13 is closed, as where;

the player scores an award by actuation of a game switch or the like through use of a playing piece, for example, a ball or puck, so that the motor 14 will have power connected thereto via conductor 15, it being observed that for simplification of the wiring diagram, one side of the I power supply circuit is connected to the symbolic common ground, as indicated at 16.

The motor 14 drives a common switch shaft 14A through a slip clutch 17, which permits said shaft to be restrained against rotation, as by an index brake plunger 18 engagable with a notch in disc 19, said brake being released by energization of brake or index coil 20 under conditions to be described.

The switch control shaft includes another common section 14B concentric with 14A and driven through another slip clutch 17A, so that the second or scrambling switch section 14B may likewise be restrained against rotation by a second or scrambling index brake means 22 acting in the several notches of its brake disc 23 and 28A, any of which may be closed from time to time depending on the positions of the several operating cam lobes on the discs 25 28, it being noted that motor 14 is of a type which includes a suitable reduction gear so that the rotation of shafts 14A, 14B is somewhat slow; and shaft 14B is released only at intervals, by reason of which the cam switches are indicated to comprise a group designated as scrambling switches, since they change the effectiveness of the game switches from time to time.

Each of the scrambling switches is connected to one of a group of game switches, as indicated, so that cam switch 25A is connected in series with game switch 25B, the remaining cam or scrambling switches 26A, 27A, 28A being respectively connected in series with certain corresponding game switches 26B, 27B, 28B, any of the latter being intended as scoring switches to be actuated by a playing piece, such as a ball, skillfully directed by the player in playing the appurtenant game.

Since the scrambling switches are closed one at a time at intervals, it is apparent that the illustrative condition of the circuit shown would require that the player close the game switch 28B in order to score, since the others are not closed by the scrambling unit, and therefore any scoring by a closure of switches 25B, 263, or 27B, would, under the conditions shown, produce no effect or award.

It is an object of the disclosed control unit to determine and change the scoring or award value for the game switches from time to time in particulars to be described.

To this end, each game switch is assigned a normal or basic score value which is controlled in part by means such as a stepping switch generally designated at 30, the service of which is to permit two score pulses for closure of the first game switch 25B, four pulses for the second game switch 26B, six pulses for the third switch 27B, and eight pulses for the last game switch 28B, responsive to the stepping of the fan contact wiper fingers 31 by action of advancing or stepping pawl 32 on ratchet wheel 33, under urgence of stepping coil 34 connected by conductor 35 and basic value relay contacts 70A (closed) to one side 11 of the power supply, and by conductor 36 to an impulsing or breaker-switch means 37, which is intermittently closed by cam disc 38 when the main index means 18 is released.

Any other type of stepping switch means may be employed, the fan switch 30 in particular being illustrative of only one suitable form of such means. The fan con- "tact 31 is restored to the normal starting position shown by conventional return-spring means (not shown) when reset pawl 32A is retracted from holding engagement with ratchet 33, as by energization of reset coil 32B upon closure of a reset switch R, which may be a part of, or controlled by, automatic resetting relay means associated with the game for conditioning the game for play, such, for example, as a coin switch or the like (not shown).

The connection of each of the game switches with the stepping switch means includes, as a part of the valuecontrol and multiplying feature, a uni-directional current control device such as the several rectifiers 25C, 26C, 27C, 28C,-which may be of any type suitable to the load requirements, ordinary metallic-oxide or selenium-layer cells being cheap and serviceable here.

The rectifier means 25C is connected in series with game switch 253 and the first looped pair of stepping contacts 25E on the stepping switch, the other game switches being respectively connected to the second, third, and fourth pairs of stepping contacts 26E, 27B, and 28E on this switch bank, there being a total of eight such contacts, giving the switch a range of eight steps.

Each rectifier 25C 280 is preferably shunted by a I corresponding and normally open sub-multiple relay switch 25D, 26D, 27D, or 28D; and the several submultiple or selector relays coils 25X, 26X, 27X, or 28X are adapted to be energized individually and selectively via corresponding conductors 55, 56, 57, 58, terminating at various contacts segments, such as those designated at 55X, 56X, 57X, 58X on a slow-acting (e.g. through reduction gearing as shown) commutating switch 60 having a wiper 61 driven from shaft 14A and connected to power supply lead 11. The segmental commutating contacts 55X 58X are of different lengths so that power will be connected through the wiper 61 to energize the several rectifier-shunting or sub-multiple or selector relay coils 25X 28X for different periods of time during the angular cycles of travel of the scrambling switch cams, whereby to cut the rectifiers selectively in and out of circuit in an irregular (i.e. scrambled) manner by short-circuiting the same through the relay switches.

At this juncture it is desirable to trace the operation of the device in part to illustrate the effect of the unidirectional current-control means on the scoring values awarded from time to time.

Assuming the condition of the parts as shown, and that motor 14 is running, it will be observed that the scrambling switch 28A happens to be closed, and accordingly power from A.C. supply line 11 is connected through conductor 71 (common to all scrambling switches) to a certain game switch 28B.

If it is assumed further that the player succeeds in closing game switch 28B as an incident to some play in the game, then alternating voltage is connected to rectifier 28C, applying a half-wave voltage to pulsing contacts 28E, wipers 31, conductor 31A to the normal or basic valuecontrol relay coil 70, which pulls up, closing contacts 7 A to connect power via conductor 35 to step coil 34 in anticipation of closure of contacts 37, and also closing contacts 703 to energize the principal index coil 20, thereby releasing index brake plunger 18 so that shaft 14A at once begins a cycle of rotation (concentric shaft 14B being restrained at this time by index brake 2223) and the pulsing cam discs 38 and 48 rotate and repeatedly close impulse switches 37, 39, and 46.

Impulse or breaker switch disc 38 has 12 teeth, while disc 48 has only 6 teeth. Accordingly, if the base-value impulse switch 46 be connected in circuit, each revolution of cam disc 48 would produce a maximum of 6 basic score pulses; but if the multiplying impulse switch 39 were in circuit, then there would be twelve such pulses per revolution.

In the condition of the circuit described to this point game switch 28B having been successfully closed by the player), the primary or basic value relay 70 pulls up as aforesaid, to index or release the motor switch shaft 14A for one cycle of rotation, thereby actuating the primary or basic impulse switch 46 to yield six operating pulses for score-award operating coil 10, via conductors 46A, 44A, and multiplier-relay contact 44 closed with its normal contact 42 (the latter connecting with conductor 35 and contacts 70A, closed, to power line 11) whereby to set up a score award of six units on the score award device.

Meanwhile, breaker switch 37 is also being opened and closed, thereby pulsing the stepping switch coil 34 via conductor 36 (returned to 35) so that the fan wiper 31 begins to step across contacts 28E for a maximum travel of eight possible steps.

However, although rectifier 28C is interposed in the aforesaid game-switcl1 scoring control circuit (28B, 31A, 70) and the basic-value relay coil 70 will be pulsed only on the half-cycle voltages of the rectified alternating current supply source, it will nevertheless hold up, keeping contacts 70A closed.

A master blocking rectifier means 80, also in series with pulse switch conductor 31A and doubler relay coil 40, is poled in opposition or opposite sign to the game switch or sub-multiple rectifier means 25C 28C, so that normally no effective current flows at all in the coil 40 ot the second control or doubler relay, and contacts 42-44 thereof remain closed during the advances of the stepping switch 30-31, so that the score award device will be impulsed six times during the first revolution of the main index disc 19, and twice more during part of the next revolution of disc 19, it being noted that since basic relay 70 holds up until the last wiper finger 31 leaves the last energized contact 28E (in this case), basic relay contacts 70B will remain closed while the stopping notch in index disc 19 comes around again to the index plunger 18 at the end of the first cycle, so that the index plunger or brake remains withdrawn and the disc 19 can start a second cycle of travel.

Thus, two additional pulses may be derived for the score award circuit, at which time the last stepping switch finger 31 will leave the last contact 28E (moving clockwise) thereby releasing basic value relay 70 and opening contacts 70A to disconnect power from the doubler relay normal contacts 4244, so that the score coil 10 can no longer be impulsed even though switch 46 continues to be closed intermittently during the remainder of the second cycle, until the index means locks the shaft 14A again.

Another example of basic score-value award or control may be postulated if it is assumed that the player should close game switch 27B which is conditioned to score by appropriate closure of scrambling switch 27A.

The stepping-switch contact group 27E represents a maximum of six possible steps which wiper 31 can take before opening the power circuit for the basic relay 70, and during the interval in which it takes the six steps, switch 46 will pulse the score award device six times in the manner heretofore described.

Should game switch 26B happen to be operated in scoring under basic value conditions, only four pulses (involving the four stepping contacts 25E through 26E) would be delivered to the score award device; or should game switch 253 be effective, then only the two stepping contacts 25E would be involved, and only two pulses would be delivered to the score award device.

It will be observed in the circuit diagram that the first control (basic) relay 70 is connected in parallel with the second (doubling) control relay 40, but the latter has interposed in such connection the oppositely poled blocking rectifier and since only rectified voltage of sign opposite to the poling of rectifier S0 is fed to these two parallel control relays, the second one (40) is normally inoperable unless the blocking effect of rectifier 80 can be by-passed or nullified; and this is what is done in one of the multiplying operations now to be described.

In order to multiply the value of a score (as by doubling it in this embodiment), the master multiplier relay coil 81 is energized, closing multiplier relay contacts 82 which shunt the multiplier blocking rectifier 80 and short-circuit the latter so that half-wave voltages passed by any of the game switches may energize the doubler relay coil 40 and close its contacts 4142, thereby connecting power from conductors 4335 and contacts 70A, via conductor 41A, to impulse switch 39, so that the latter can be closed a maximum of twelve times per indexing cycle of shaft 14A, and hence of disc 38, to pulse score award coil 10 via conductors 39A, 45 a corresponding number of times, it being observed, however, that since the capacity of stepping switch means 3031 is only eight steps, it is necessary for the twelve switch-operating teeth on disc 38 to be spaced to close switch 39 twice as frequently as the other impulse switch 46 is closed by cam disc 48 during any one revolution or indexing cycle.

The disabling or short-circuiting of the multiplier rectifier 80 as aforesaid is effected by occasional energization of multiplier relay coil 81 via conductor 83 connected to power through commutating switch segment 59X when the latter is engaged by wiper contact 61.

It will be apparent that the foregoing pulse-multiplication control efiected by relay means 8182, will multiply by a factor two the predetermined basic or normal pulse value accorded to any of several game switches 25B 28B, notwithstanding the fact that only half-wave voltages are passed by the game switch rectifying means.

But it is an important object of the invention to provide another selective multiplying action which is independent of any operation of the master multiplying relay, and which has been characterized as a sub-multiplying )peration to distinguish from the master multiplying means in the respect that the normal score value for any game switch may be multiplied by energization of any corresponding sub-multiplier relay 25X, 26X, 27X, or 28X inder control of the commutator switch 60, which, by engagement of wiper 61 with any of the segments 55X, 56X, 57X, or 58X, will apply power via the conductors 55, 56, 57, or 58 to the corresponding sub-multiplying ."elay.

Energization of any of the sub-multiplying relays as aforesaid will short-circuit or by-pass a corresponding one of the sub-rectifiers 25C, 26C, 27C, or 28C, so that the full-Wave alternating voltage will be applied by the corresponding game switch, through the stepping switch, to conductor 31A, with the result that the basic-value relay 70 will be energized by the full-wave voltage, and the doubler relay 40 will be energized by a half-wave voltage, with the pulse-multiplying effect heretofore described, depending in value upon the particular pulsing switch involved.

Thus, there is disclosed a control circuit providing a basic award or normal pulsing circuit with various predetermined pulse values normally assigned to the several game switches, together with a master multiplying circuit and a sub-multiple or selective multiplying circuit means, all operating dependently upon half-wave and full-wave alternating voltages obtained by current-blocking means or rectifiers connected to pass said voltages to value-control relays and circuits in various arrangements controlled by some mixing or varying or selecting means, which in the illustrative embodiment shown, is the scrambling and commutating means 25 28, 38, 48, and associated switch parts, and means 60--61, etc.

The disclosed multiplying circuit is adaptable to other uses to control counting devices selectively, and the game switches 25B 28B may be replaced by other types of selecting switch; for example, these switches may be manually operated, and the scrambling switches 25A 28A may be omitted so there will be at all times a choice of selecting switches to be operated at will.

Also, the multiplying effect may be expanded or changed by the addition of pulsing switches, such as switches 38-39, 4648; having greater or lesser numbers of switch-operating teeth.

If desired, some of the multiplying relays of the submultiple group (25X 28X) may be omitted or connected for optional actuation by manual switches accessible to the player.

The foregoing and other modifications may all be made within the scope of the concepts disclosed.

I claim:

1. In a control circuit, a first control relay, means for connecting a source of rectified alternating voltage to said first relay to actuate the same, a second control relay connected in parallel with said first relay through a blocking rectifier of opposing sign to said voltage, and master relay means operable to short-circuit said rectifier to effect energization of said second relay by said voltage.

2. In a control circuit, a first control relay, a source of alternating operating voltage, and means connecting the same to said first relay through a half-wave rectifier; a second control relay connected in parallel with said first relay through a half-wave blocking rectifier poled in opposition to said first rectifier whereby the second relay is normally rendered inoperable by said voltage, and selectively operable switch means for short-circuiting either of said rectifiers to produce operation of the second control relay.

3. In a control circuit, a basic control relay and a doubler relay connected in parallel through a half-wave blocking rectifier, a source of alternating supply voltage for actuating said relays, a plurality of half-wave rectifiers and switch means for selectively connecting any of the same in series with said voltage and said parallel-connected relays to deliver a half-Wave rectified voltage thereto poled in opposition to said blocking rectifier such that said rectified voltage will normally actuate said basic relay but not said doubler relay, and selectively operable circuit means for providing a bi-laterally conductive shunt path around any of said rectifiers to render said doubler relay operable by said supply voltage.

4. In a game control circuit, a basic'score control relay connected in parallel with a doubler relay, a halfwave blocking rectifier in series with the doubler relay in said parallel connection, a plurality of game switches selectively operable to connect an alternating supply voltage to said parallel connected relays, half-wave rectifier means interposed in the aforesaid supply voltage connection to block the voltage component of like polarity to the poling of said blocking rectifier so that said voltage component will not normally actuate said doubler relay, selectively operable multiplying relay means for shunting out any said rectifier to render said doubler relay operable -by said voltage component, a first pulsing switch means actuated under control of said basic and doubler relays to produce a certain normal number of pulses responsive to operation of a selected game switch under the condition providing a rectified voltage of polarity to operate the basic relay but not the doubler relay and to produce a multiplication of the normal number of pulses under the condition where there is a voltage of polarity to operate said doubler relay, at least, together with game score means actuated by said pulses.

5. A game control circuit according to claim 4 and further including an automatic scrambling switch means and an operating circuit therefor operable to connect and disconnect said game switches with said alternating supply voltage from time to time as a function of operation of the game.

6. Agame control circuit according to claim 4 and further characterized by the provision of commutating switch means cooperable with said control circuit for automatically and selectively energizing said multiplying relay means from time to time to change the pulse scoring values obtainable by operation of certain game switches.

7.. In a game control circuit, an alternating supply voltage, a plurality of game switches each in series with said voltage and a half-wave rectifier, multiplying relays connected for actuation to shunt out any said rectifier, a stepping switch and stepping means for the same, a basic relay and a doubler relay connected for actuation through said stepping switch to said game switches and corresponding rectifiers to pass rectified voltages of given polarity for different periods each determined by the number of steps taken by the stepping switch responsive to operation of any of said game switches, said doubler relay having master rectifier means in series therewith and poled oppositely to said given polarity normally to block operation of the doubler relay by voltages of said given polarity, a master multiplying relay operable to shunt said master rectifier, circuit connections controlled by said basic relay for actuating said stepping means, responsive to effective operation of a selected game switch, a score award device actuated by pulses, and pulse switch means operably controlled by said basic and doubler relays for pulsing said award device a different number of time dependent upon the number of steps taken by said stepping switch and whether both or one of the said basic and doubler relays is actuated as aforesaid.

8. The circuit set forth in claim 7 further characterized by the provision of a commutating switch and operating means therefor operating to energize any of said multiplying relays automatically from time to time to change the score pulse value for one or all of said game switches depending upon which of said multiplying relays is energized.

9. In a control circuit, pulse switch means for producing a predetermined normal number of pulses and also a greater multiplied number of pulses, normal value relay means responsive to alternating current energization and connected for operation to actuate said pulse switch means to yield said normal number of pulses, an operating circuit for said normal value relay means and including a source of alternating voltage and rectifier means for energizing the same on half-wave rectified voltages, and an alternating current-responsive multiplier relay operable to connect said pulse switch means to yield a multiplied number of pulses, said multiplier relay being connected for operation by the aforesaid half-Wave voltages but having normally the operating circuit thereof blocked by rectifier means preventing operation thereof by said half-wave voltages, and switch means for selectively short-circuiting said blocking rectifier means whereby said multiplier relay means may be rendered operable by said half-wave voltages.

10. In a control circuit, a plurality of control relays, an operating circuit for each relay including connection with a source of alternating relay-operating voltage, rectifying means in circuit with certain of said relays for actuating the same by rectified voltages of predetermined sign, rectifier means connected in certain of said operating circuits in opposite sign to block current from said rectified voltages and normally prevent operation of the associated relay, and means for selectively short-circuiting any rectifier means to selectively effectuate operation of an associated relay by the available rectified voltage.

11. For use in a control circuit, selective relay operating means including a first relay operable by alternating or unidirectional current, and an operating circuit for connecting the same with alternating current, a second relay operable by alternating or unidirectional current and connected in said operating circuit, means in said operating circuit for rectifying said alternating current to permit only a unidirectional current component of predetermined polarity to flow therein, rectifying means in circuit with a particular one of said relays for normally blocking effective current of said predetermined polarity to said particular relay whereby the latter relay is prevented from operating, and circuit means for selectively providing a shunt path to alternating current around either rectifying means whereby to render said particular relay operable by at least one half-wave component of said alternating current.

12. In game apparatus including a pulse-actuated score award device, and a game switch actuated by a playing piece, a control circuit comprising: a first control relay, means controlled by said game switch for connecting a source of rectified alternating voltage to said first relay to actuate the same, a second control relay connected in parallel with said first relay through a blocking rectifier of opposing sign to said voltage, and master relay means operable to short-circuit said rectifier to effect energization of said second relay by said voltage, together with pulse switch means controlled by said first and second relays and connected to pulse said award device a differ-Jul number of times depending upon whether one or both of the said first and second relays are energized.

13. In an electrically controlled ball game including a ball-operated game switch, a pulse-operated game scorea\vard device, andan electrically-actuated pulsing switch with selectable pulse-circuit means for producing differcut numbers of pulses, a pulse-control circuit comprising: a first control relay and means including said game switch for connecting a source of alternating voltage to said first relay in series with a half-Wave rectifier; a second control relay connected in parallel with said first relay through a half-wave blocking rectifier poled in opposition to said first rectifier whereby the second relay is normally rendered inoperable by said voltage; circuit connections controlled by said first and second relays for selectively connecting said pulse-circuit means to actuate said score award device to pulse the latter a different number of times depending upon whether one or both of said first and second relays is operated by the game switch as aforesaid; and selectively operable switch means for short-circuiting either of said rectifiers to produce operation of the second control relay, concurrently with the first relay.

14. In a game control circuit, game switch means actuated by an instrumentality used in playing the game; an electrically-actuated score-award device, selectivelyoperable award circuits adapted to be connected with said award device to actuate the same different amounts for correspondingly different award-value operations thereof; a basic control relay connected for operation by said game switch means with a source of alternating supply voltage; a doubler relay connected in parallel through a first blocking rectifier of certain polarity with said basic relay; a plurality of secondary blocking rectifiers and additional switch means cooperable with said game switch means for selectively connecting any of the secondary rectifiers in series with said voltage and said parallel connected relays to conduct a rectified operating voltage thereto which is poled in opposition to said first blocking rectifier such that the voltage from said secondary rectifiers will normally actuate said basic relay but not said doubler relay; selectively operable shunt-circuit means for connecting a bi-laterally conductive shunt path around any of said rectifiers to render said doubler relay operable by said supply voltage; said basic relay having relay switch connections operated thereby for connecting a said award circuit of given value to said award device, and said doubler relay having relay switch connections operated thereby for connecting another said award circuit of different value to said award device.

15. In a control circuit, pulsing switch means and selective connections therewith for producing different numbers of pulses; control means including relays connected for actuation to select the aforesaid connections to determine the effective number of pulses available from said pulsing switch means; and relay-actuating circuits including aplurality of power connections with a source of alternating current and each having corresponding rectifying means poled to block said current and thereby prevent flow of relay-operating current of a certain polarity; means polarizing one of said relays for operation by current of said certain polarity; and further switch means connected for operation to provide a conductive path around a desired rectifying means to selectively pemit flow of operating current of said certain polarity to actuate said certain relay.

16. In a game control circuit, selective relay operating means including a first relay connected for operation by alternating or unidirectional current and an operating circuit therefor connecting the same with a source of alternating current; a second relay operable by alternating or unidirectional current and connected in said operating circuit; polar-selective means in said operating circuit permitting only a unidirectional current component of predetermined polarity to flow therein; further polarselective means in circuit with a particular one of said relays and normally opposing flow of effective operating current of said predetermined polarity to said particular relay whereby the latter is normally prevented from operating; separately operable shunt switch means connected respectively with the polar means aforesaid and respectively operable to short-circuit the same to provide a shunt path to alternating current around either polarselective means whereby to render said particular relay operable by at least one polar or half-wave component of said alternating current; a plurality of score-award circuits each connected for effective award operation by connections controlled by relay switch means respectively appertaining to said first and second relays; a plurality of game objective devices adapted to be actuated as a result of playing of the game; means interconnecting said objective devices with said alternating current source and said operating circuit for the first and second relays for actuation of the latter subject to action of the polar selective means aforesaid under control of certain game objective devices; and commutation switch means operated under control of one of said relays for actuating certain of said shunt switches.

17. In a control circuit for game apparatus which includes a plurality of game switches, in combination: two control relays; an operating circuit for each relay including connection under control of certain game switches with a source of alternating current; rectifying means in circuit with a certain control relay for actuating the same by current of predetermined polarity; opposing rectifying means connected in certain of said operating circuits in the opposite polarity to prevent flow of operating current of the first-mentioned polarity for the certain control relay aforesaid; selector relays each including switch means operable responsive to actuation thereof for shunting out one of said opposing rectifying means to permit passage of current of required polarity to effect operation of said certain control relay; together with an electrically-actuated score-award device producing different inward results responsive to difierent operating currents applied thereto and selectable operating circuits therefor each connectible to said device by circuit means controlled by at least one of said control relays, said selectable operating circuits each connecting diiferent operating control currents to said award device.

References Cited in the file of this patent UNITED STATES PATENTS 826,090 Doran July 17, 1906 2,152,598 Mills Mar. 28, 1939 2,165,059 Koci July 4, 1939 2,296,548 Williams et al Sept. 22, 1942 2,315,191 Elliott Mar. 30, 1943 2,467,901 McArthur 1- Apr. 19, 1949 2,610,059 Koci Sept. 9, 1952 FOREIGN PATENTS 147,614 Switzerland Sept. 1, 1931 447,177 Italy Apr. 4, 1949 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 2,882,056

Donald E. Hooker It is herebj certified that error appears in the-printed specification of the above numbered patent requiring correction and that the said Letters Patent should read as corrected below.

Column 10, line '7, for "inward" read award Signed and sealed this 18th day of August 1959.

Attest:

KARL H. AJCLINE ROBERT C. WATSON Attesting Officer Commissioner of Patents.

April 14, 1959 

